<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0,user-scalable=no">
    <title>Document</title>
<link href="mystyle.css" type="text/css" rel="stylesheet" />
   
   <!-- 本地 -->
   <link href="../static/bootstrap-3.4.1/dist/css/bootstrap.css" 
   type="text/css" rel="stylesheet" /> 
</head>
<body>
    <!-- HTML原始端的实际效果 -->
    <div  style="background-color:red">1111</div>      
    <div  style="background-color:rgb(0, 255, 0)">2222</div> 

    <hr/>
    <div class="container"  style="background-color:blue">   
    <!-- <div class="container-fluid" style="background-color:blue">    -->
        <div class="row">      
          <div class="col-md-4  col-xs-2"  style="background-color:red">1111</div>      
          <div class="col-md-2  col-xs-2"  style="background-color:rgb(0, 255, 255)">222</div>      
          <div class="col-md-7  col-xs-2" style="background-color:rgb(0, 255, 0)">33</div>         
        </div>      
    </div>   

</body>

</html>